Compressor



HIl-IU Dec. 30. 1924.

C. H. ALLEN COMPRESSOR Filed May 5 191 9 17/ /j/////////////////////1///// ////Z/ /w State of Patented Dec. 1924.

UNITED STATES l,521,2ll- PATENT OFFICE.

W E. AI'IEN, OF CLABEMONT, NEW EAMPSHIRE, ASSIGNOB TO SULLIVAN EA.- CEINEBY COMPANY, A COR-PORATION OF MASSACEUSETTS.

COMPBESSOB.

Application filed May 5,

To all whom it may concem:

Be it known that I, CHARLES H. ALLEN, a citizen of the United States, residing at Claremont in the county of Sullivan and New Hampshire, have invented certain new and useful Improvements iu Compressors, of which the following is a full, clear, and exact specification.

This invention relates to compressors and more particularly to compressor unloading mechanism.

One object of the present invention is to provide an improved unloading means. Still another object is to provide an improved controlling means for controlling a flow of pressure fluid to an unloading mechanism whereby the flow to the nechanism and the exhausting of the pressure fluid therefrom may be easily and accurately con- 'tro1led. These and other objects and advantages of my improved Construction will,

however, hereinafter more fully appear.

In the accompanying drawings, I have shown for urposes of illustration one embodiment w ich my invention may assume in practice.

In these drawiLgs,--

Fig. l is a side elevation of a compressor unit, parts thereof being shown in section to facilitate illustration.

Fig. 2 is a -longitudinal sectional view through the controlling means which controls the unloading mechanism.

In this illustrative construction I have 36 show a compressor unit having a cylinder 1 into which air is drawn through an nlet 2 past the inlet valves 3, herein shownas of v the spring pressed puppet valve type, the

compressed air being discharged through 4 outlet valves 4 and through a pipe 5 to a receiver 6 from which the fluid is taken to the line by a main 7. When the pressure in the receiver rises above normal, pressure fluid is admitted by a suitable controlling means 8 from the receiver 6 through pipe the flow of 1ines'9 and 11 to force plungers 12 upward to hold the intake valves ofl their seats and thereby unload the compressor.

The pilot valves usually used to control ressure fluid from the receiver to the unloa ing mechansm have a pressure operated diaphragm or piston, herein the former is shown at 13, which is normally depressed by a. relatively heavy spring 14 whose tension may be adusted, as by an ad- 1919. Serial No. 294371.

justable sleeve 15, to hold a valve element 16 against a cooperating valve seat 17, and thereby close communication between the conduits 9 and 11. When the pressure in the tank rises above normal Operating pressure, the fluid pressure on the lower side of the diaphragm 13 will move the valve element 16 upward against the tenson of the spring 14 and permit a flow of compressed air from the tank to the lower sides of the piston 12 and thereby unload the compressor. It is also a common practice to provide an exhaust port between the valve seat 17 and pistons 12 to exhaust pressure fluid from the conduits 11 after the valve 16 is again seated, and thereby load the compressor. However, these exhaust'ports are always open and permit a flow of pressure fluid to the atmosphere during both the loading and th unloading of the compressor. Because the flow of pressure fluid from the valve 8 to the unloading mechanisni would be very slow and ineflicient if the exhaust port were large, this exhaust port is made Very small, usually about twohundredths of an inch in diameter. Because this exhaust port is so small, the re loading of the compressor takes an appreciable time and often more time than is necessary to permit the compressor driving means to come up to speed if the compressor driving means has stopped or slowed down during the unloading interval.`

In my improved controlling means, I preforably provide a relatively large exhaust port 18 communicating with the ati mosphere, as through a relatively large passageway 19, and I also provide an exhaust port closing means, such as the movahle valve member 20, which is normally held in an inoperative position by a spring 21 which abuts against a disk 22 formed on one end of the valve member 20, and a boss 23 formed on the side of the valve ni ple 24. This valve member 20 may be force 1nwardly to close the exhaust during the unloading of the compressor, by any suitable means, but for this purpose I preferably provide a bell crank 25 pivotally mounted on a bolt 26 carried by an extension 27 of the valve casing 8, one arm 28 of the bell crank being projected within the valve casing into contact with the hearing 29 mounted upon the upper side of the diaphragm 13 in such a manner that when the diaphragm 13 is moved upwardly to raise thevalve element 16, the other arm 30 of the bell crank will force the valve member 20 inwardly to close the exhaust port 18.

' he position of the valve member 20 reltive to the exhaust port may be adjusted through manipulation of an adjusting screw 31, herein shown as carried adjacent the end of the bell crank arm 30. As the upward movement of the diaphragm 13 may force the valve element 20 against its seat with coniderable pressure and bend `or distort one or both of the arms of the bell crank, I preferably provide a resilient means between the diaphragm and the valve element 20 which will prevent the distor tion of any of the Operating. arts. In the form of my invention shown erein, I provide this resilient connection by cutting away a portion of the arm 30, as shown at 32, so that this arm will be flexed should the end of the valve member 20 strike its seat before the diaphragm has moved to the upper limit of its travel.

It is thus seen that I have provided an improved inloadng means which permits a rapid exhaust of the pressure fluid from the uuloading mechanism and that I have provided an improved adjustable means for closing the exhaust port. It should further be noted that this 'adjustable means may be operated to adjust the size of the exhaust port and thereby adjust the time element governing the reloading of the compressor after the supply of pressure fluid from the tank has been cut ofl'. 'It should also be observed that when the supply of pressure fluid is admitted to the unloading mechanism, the exhaust ort is automatically closed, and that there y the operation of the unloading mechanism to unload the compressor is made more positive, more aceu rate. and more eficient.

While I have in this application specifically described one cmbodiment which my invention may assume in practice, it is to be` a understood that this form is used for illustrative purposes only and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of` the appended 'claims What I claim as new and desire to secure by Letters Patent is:

1. A compresso'r unloading means comprising. in combination, an unloading mechanism, fluid pressure conducting means coms municating therewith, and a pressurefluid controlling means for alternately permittin a flow to said unloading mechanism an exhausting fluid therefrom, said means comprisi'ng a plurality of valves moving in lines arallel to` intersecting lines. y

2. In co'mbination, a compressor unloading means. fluid pressure actuated Operating means therefor, and controlling means for prising, in combination,

4.'A compressor unloading means com:

prising, in combination, an unloading mechanisn, fluid pressure conducting means con`- nected thereto, and a pressure fluid controlling means comprising a valve normally closing said conducting means, an exhaust 5 port for exhausting'pressure fluid from said unloading mechanism, and adjustable means` for closing said exhaust port when said valve s open; i

5. A compressor unloadng means comprising, in combination, an unloading mesh anism, fluid pressure conducting means connected thereto, and a fluid pressure `controlling means comprising a diaphragm and a plurality of valves controlled` thereby, one of said valves being rigidly connected to said diaphragm while another is controlled thereby by mechanism Contacting therewith.

6. A compressor unloading means comprising, in combination, an unloading mechanism, fluid pressureeonducting means connected thereto, and a pressure fluid controlling means for alternatively permitting a flow to and from said unloading mechanism comprising a plurality of simultane' ously operative separately spring pressed valves set to open and close at a 'predetermined pressure.

A compressor unloading means comprsngl in combnaton, an unloadmg mechamsm, fluid pressure conductng means connected thereto including a port, and a pressure fluid controlling means therefor including a plurality of angularly moving end seating valves controlling the flow of -pressure to and from said ort.

8. A compressor oading means coman unloadingmechanism, fluid pressure conducting means connected thereto, and a pressure fluid controlling means therefor comprising a plurality of separate resiliently seated end-seati-ng valves having different rates of simultaneous movement; one operative upon movement of another. i

9. A compreesor unloadn' prising, 'in combi'nation, an un oading mechanism, fluid pressure conducting means connected threto, a plurality of simultaneo moving valves controlling the flow thro means comsaid conducting means, and fluid actuated means set at a predetermined pressure to control said valves, one of said valves being Secured the'cto and movablc the'ewith to assist movement thereof. 4

10. In combination, a compressor unloading means, fluid pressure actuated Operating means therefor, and controlling means for said Operating means comprising a member responsive to receive pressure, inlet and discharge connections for said Operating means, and separate valves for controlling said connections movable in different directions by said member.

11. In combination, a compressor unloading means, fluid pressure actuated Operating means therefor, and control-ling 'means for said Operating means comprising a member 'esponsive to receiver pressure, inlet and discharge connections for the Operating means, and separate valves for controllin said connections, one of said valves being drectly connected to said member and the other being resiliently connected thei-eto.

.from.

12. In combination, a compressor unloading means, fluid pressure actuated Operating means therefor, and controlling means for said Operating means comprising a member responsive to receiver pressure, iniet and dis charge connections for the Operating means, and separate valves for controlling said c'onnections, one of said valves being directly actuated by said member and .the other being operated by way of a bell crank there- 13. In combination, a compressor unloading means, fluid pressure actuated Operating means therefom and controlling means for said Operating means comprising a member -esponsive' to rcceiver pressure, a branched passage connected wth said operatin means, one of said branches being adapte 4 to be connected to the atmosphere, and the other with'a'fluid pressure su ply, and end seatin valves controlling said passages and contro led by said member.

14. A compressor unloadin means comprisin'g, in combination, an un oading mechanism, fluid pressure conducting means communicating therewith, and a pressure fluid cont'olling means for alternatively permitting a flow of pressure fluid to said unloading mechanism and exhausting fluid therethrough, said means including a diaphragm having a plurality of springs constantly acting the'eon in one direction and a valve resiliently operatively connected to said diaphragm.

15. A compressor unloadin means comprising, in combination, an un oading mechanism, fluid pressure conducting means communicating therewith,. and a pressure fluid controlling means for alternately permitting a flow of pressure fluid to said unloading mechanism and exhausting fluid therethrough, said means including a diaphragm and a lurality of spring pressed valves operated thereby adapted to open and close at a predetermined pressure.

16. A compressor unloading means comprising, in combination, an unloading mechanism, fluid pres'sure conducting means communicating therewith, and a ressure fluid controlling means for alternate y permitting a flow of pressure fluid to said unloading mechanism and exhausting fluid therethrough; said means including a diaphra and a plurality of valves operated there y, said valves moving in lines parallel to intersecting lines.

17'. A compressor unloading means comprising in combination, an unloading mechanism, inlet and dischar fluid pressure conducting means connecte thereto, and a plurality of valves having different rates of simultaneous movement for controlling flow of flui through said conducting means.

18. prising, in combinaton, an unloading mechanism, fluid pressure conductingmeans connected thereto, a plurality of valves having different rates of simultancous movement for controlling the flow of fluid through said conducting means, and fluid actuated means set ata predete'mined pressure to control said valves. y

In testimony whereofI aflix my si ature.

CHARLES H. AITEN.

compressor unloadiig means com- V ;'tiai' equnn correction s follow:: 'Pagg 3,

certificate of correction.

` l is herel' certified that in L'awe- Pabet No. 1f,521,211, grnbe Decanbe ao,

u' n &application ofChu-les H. Allen Clrenont New Hamphre -ovement in Comp'emors,-m 'en-or fppeara in the; 7 tod specific.. lines 63 and 74, ims 15 `and 16,

1301- -th woiflFltomtly re'dpl ematwdy and that the said Letters Pateit --hould be read with thsoorreeton ther-ein at the same may; conform to the of the case in'th Ptent .01509.

` w; Signed :nd sealed this 17th day of February, A. D. 1925. 4

. feim] KARL FENNING,

* ctmg flommz'uioner of Patents. 

